eBooks are booming. But you knew that. You also knew or could suss out some of the findings from Revealing the Business of eBooks: 2009-2012, the 4th eBook survey of publishers by by Aptara and Publisher’s Weekly.

According to the report, 36% of eBook publishers are “realizing double-digit annual eBook revenues” This is up 100% year over year. 100% is big.

Digital or print? As in last year’s survey, this year’s response was not either/or but both. In 2011, 85%of publishers said they were producing digital editions of their print titles rather than producing digital editions in lieu of print. The same numbers held strong, rising a single point this year to 86%